这个问题是由一个 ClosedXML 实现错误。

The issue is caused by a ClosedXML implementation bug.

可以使用以下代码片段（其数据透视表示例的修改版本）轻松地进行复制，并在Excel中打开生成的文件：

It can easily be reproduced by using the following snippet (a modified version of their Pivot Tables example) and opening the resulting file in Excel:

static void CreateTestPivotTables(string filePath)
{
    var wb = new XLWorkbook();

    var wsData = wb.Worksheets.Add("Data");            
    wsData.Cell("A1").Value = "Category";
    wsData.Cell("A2").Value = "A";
    wsData.Cell("A3").Value = "B";
    wsData.Cell("A4").Value = "B";
    wsData.Cell("B1").Value = "Number";
    wsData.Cell("B2").Value = 100;
    wsData.Cell("B3").Value = 150;
    wsData.Cell("B4").Value = 75;
    var source = wsData.Range("A1:B4");

    for (int i = 1; i <= 2; i++)
    {
        var name = "PT" + i;
        var wsPT = wb.Worksheets.Add(name);
        var pt = wsPT.PivotTables.AddNew(name, wsPT.Cell("A1"), source);
        pt.RowLabels.Add("Category");
        pt.Values.Add("Number")
            .ShowAsPctFrom("Category").And("A")
            .NumberFormat.Format = "0%";
    }

    wb.SaveAs(filePath);
}

该错误位于 XLWorkbook_Save.cs - GeneratePivotTables 方法： / p>

The bug is located in XLWorkbook_Save.cs - GeneratePivotTables method:

private static void GeneratePivotTables(WorkbookPart workbookPart, WorksheetPart worksheetPart,
    XLWorksheet xlWorksheet,
    SaveContext context)
{
    foreach (var pt in xlWorksheet.PivotTables)
    {
        var ptCdp = context.RelIdGenerator.GetNext(RelType.Workbook);

        var pivotTableCacheDefinitionPart = workbookPart.AddNewPart<PivotTableCacheDefinitionPart>(ptCdp);
        GeneratePivotTableCacheDefinitionPartContent(pivotTableCacheDefinitionPart, pt);

        var pivotCaches = new PivotCaches();
        var pivotCache = new PivotCache {CacheId = 0U, Id = ptCdp};

        pivotCaches.AppendChild(pivotCache);

        workbookPart.Workbook.AppendChild(pivotCaches);

        var pivotTablePart =
            worksheetPart.AddNewPart<PivotTablePart>(context.RelIdGenerator.GetNext(RelType.Workbook));
        GeneratePivotTablePartContent(pivotTablePart, pt);

        pivotTablePart.AddPart(pivotTableCacheDefinitionPart, context.RelIdGenerator.GetNext(RelType.Workbook));
    }
}

按行 workbookPart。 Workbook.AppendChild（pivotCaches）; 它将多个 PivotCaches 添加到 workbookPart.Workbook 允许包含0或1。

by the line workbookPart.Workbook.AppendChild(pivotCaches); which adds multiple PivotCaches to workbookPart.Workbook while it's allowed to contain 0 or 1.

正如上所述，通过修改上述方法，修复它的唯一方法是在源代码中，如下所示：

With that being said, the only way to fix it is inside the source code by modifying the above method as follows:

private static void GeneratePivotTables(WorkbookPart workbookPart, WorksheetPart worksheetPart,
    XLWorksheet xlWorksheet,
    SaveContext context)
{
    var pivotCaches = workbookPart.Workbook.GetFirstChild<PivotCaches>();
    foreach (var pt in xlWorksheet.PivotTables)
    {
        var ptCdp = context.RelIdGenerator.GetNext(RelType.Workbook);

        var pivotTableCacheDefinitionPart = workbookPart.AddNewPart<PivotTableCacheDefinitionPart>(ptCdp);
        GeneratePivotTableCacheDefinitionPartContent(pivotTableCacheDefinitionPart, pt);

        if (pivotCaches == null)
            workbookPart.Workbook.AppendChild(pivotCaches = new PivotCaches());
        var pivotCache = new PivotCache { CacheId = (uint)pivotCaches.Count(), Id = ptCdp };
        pivotCaches.AppendChild(pivotCache);

        var pivotTablePart =
            worksheetPart.AddNewPart<PivotTablePart>(context.RelIdGenerator.GetNext(RelType.Workbook));
        GeneratePivotTablePartContent(pivotTablePart, pt);
        pivotTablePart.PivotTableDefinition.CacheId = pivotCache.CacheId;

        pivotTablePart.AddPart(pivotTableCacheDefinitionPart, context.RelIdGenerator.GetNext(RelType.Workbook));
    }
}

更新：消息是，我的帖子触发了 ClosedXML源版本库修复，由 Francois Botha （也称为 petelids 谁带来了那里），所以你可以从那里直接下一个版本的代码，希望包括它。

Update: The good news are that my post triggered a ClosedXML source repository fix by Francois Botha (also credits to petelids who brought it up there), so you can take the code from there until their next release which hopefully will include it.